TPN may refer to:

Science and Medicine

  • Total parenteral nutrition
  • Triphosphopyridine nucleotide, the previous name for nicotinamide adenine dinucleotide phosphate (NADP<sup>+</sup>)
  • Task Positive Network, see Dorsal attention network

Organisations

  • Society of Friends of Science in Warsaw () in Warsaw
  • Tatra National Park, Poland ()

Other

  • Third-party note or Note verbale, a diplomatic document
  • Tupinambá language, by ISO 639 code
  • Tiputini Airport, Ecuador
  • Treaty on the Prohibition of Nuclear Weapons
  • "The Promised Neverland" (Manga / Anime Series)